Thucydides of Athens, one of the greatest of historians, was born about 471 BCE. He saw the rise of Athens to greatness under the inspired leadership of Pericles. In 430, the second year of the Peloponnesian War, he caught and survived the horrible plague which he described so graphically. Later, as general in 423 he failed to save Amphipolis from the enemy and was disgraced. He tells about this, not in volumes of self-justification, but in one sentence of his history of the war that it befell him to be an exile for twenty years. He then lived probably on his property in Thrace, but was...